Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad9c800a47d2120c…

MALICIOUS

PDF

68.6 KB Created: 2021-03-01 02:54:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 4156cde6ca67b89136f657499026d208 SHA-1: db975897c0eed2516b3d5ec3b0efafd5af0535dc SHA-256: ad9c800a47d2120c8fad1a9c9301c97f0670485ca7feae2d66861f5565d29c18
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains and link farms, suggesting an attempt to redirect users to malicious sites. The document body, though heavily corrupted, contains metadata related to 'wkhtmltopdf' and a trimmer head removal, likely a lure to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://lozipotod.ru/aws?utm_term=troy+bilt+tb22+trimmer+head+removal PDF link annotation
    • https://cdn.sqhk.co/mifigatira/gglX5gi/download_hay_day_game_for_pc_without_bluestacks.pdfIn PDF document text
    • http://7lessons.site/courier_companies_tracking_number_formats1pym0.pdfIn PDF document text
    • http://roxedizusugu.mywebcommunity.org/befageneberutaxuxu.pdfIn PDF document text
    • http://uber-global.com/34468151656lnox6.pdfIn PDF document text
    • http://fakixigulidol.mywebcommunity.org/survival_servers_minecraft.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417315/normal_5ff3a79123330.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419001/normal_5fdc4b416fd31.pdfIn PDF document text
    • http://boevoenlp.com/stanley_garage_door_bottom_weather_seal_canada6cyb9.pdfIn PDF document text
    • http://finipupote.mywebcommunity.org/ponniyin_selvan_movie_first_look_poster.pdfIn PDF document text
    • http://fefiwizam.sportsontheweb.net/rain_bird_esp-rzx_installation.pdfIn PDF document text
    • https://cdn.sqhk.co/fefowofuk/gbLXjFQ/master_craftsman_las_vegas.pdfIn PDF document text
    • http://trysol.xyz/jump_rope_workout_to_burn_500_caloriesbxcae.pdfIn PDF document text
    • http://jarewitof.mypressonline.com/artemis_fowl_time_paradox_audiobook_nathaniel_parker.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0AE 5272 bytes
SHA-256: d6accf270e9f198912bfa314a8244c1c5a297581bbd8a5534bbdd8402fca9e1c
font_01_sfnt_off0000e271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE271 10368 bytes
SHA-256: dcf1ea8af60b47984efe27b64577cafccff29b75f7b4cf2f8685e0c5f8238d16

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